Albert d



(No Model.)

A A. D. PENTZ. I ROTARY ATTACHMENT FOR MILLING MACHINES. No. 461,201. Patented Oct. 13, 1891.

r 7/ M y .2 h w w W H a M v a v M m 7 m m Q m i n i o o M \Q a m X \w A x m 1| N-Wm X. Y T W Q y W UNITED STATES PATENT OFFICE.

ALBERT D. PENTZ, OF ELIZABETH, NEWV JERSEY, ASSIGNOR TO HIMSELF, AND ABRAHAM VANDERBEEK, O F NEYV YORK, N. Y.

ROTARY ATTACH M ENT FO R M lLLlNG-MACH IN ES.

SPECIFICATION forming part of Letters Patent No. 461,201, dated October 13, 1891.

Application filed February 20, 1891. Serial No. 382,138. (No model.)

To all whom 212'; may concern:

Be it known that I, ALBERT D. PENTZ, a citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented an Improvement in Rotary Attachments for Milling-Machines,

of which the following is a specification.

The object of this invention is to provide for milling the faces and edges of gear-blanks,

pistons, pulleys, wheels, and other circular articles with reliability and rapidity, and this device is usually employed as an attachment to a universal milling-machine, and by this improvement one or two circular articles can be mounted upon a shaft that is progressively rotated to present the article to the action of the milling-tools, and this attachment is adapted to be placed upon slide rests or beds capable of adjustment in two directions horizontally, so as to bring the article in the proper position for the milling-tools, and usually a vertical adjustment is also provided for convenience in presenting the ar-- ticle to the tools. I have reduced this invention to practice by constructing the mechanisms illustrated in the accompanying drawings.

In the drawings, Figure l is a perspective view. Fig. 2 is an elevation; Fig. 3,a section at the line 00 w, and Fig. 4 is a horizontal section through the actuating-shaft. Fig. 5

.is a separate view of the screw-collar.

The stock or bed A of the machine is a hollow casting, the bottom surface of which is flat and adapted to rest upon and be secured to a platen or slide-rest B, which is adjustable longitudinally in the swivel-plate O by a screw 2, and this swivel-plate O is connected with the saddle D, so that the milling attachment and the article carried by it can be adjusted horizontally and placed in the proper position in relation to the millingtools E, and it is also advantageous for the saddle D to be supported by a knee-plate and bracket F, that is adj ust-able vertically upon the column G, so as to raise and lower the milling attachment and the articles carried by it and place the same in any desired position in relation to the milling-tools E.

I do not in this application lay claim to any peculiarity in the universal milling-machine to which this attachment is especially adapted. It is preferable to provide on the under edges of the bed A lugs passing down into the groove in the platen B, and clampingscrews 3 are also used for holding the attachment in position upon the platen or slide-rest.

The upper part of the bed or base A is made with a tubular bearing 4 for a supporting shaft or'spindle H. This tubular bear- :ing has projecting flanges 5 at one side, and in the construction of the attachment the hole for the supporting-shaft H is bored out accurately, after which the projecting flanges 5 are slotted in a horizontal plane parallel to the axis of the shaft H, and there are tightening-screws passing through these projecting flanges, sothat the bearing for the shaft H can be tightened up from time to time to prevent any looseness. This point is of importance, because the articles that are to be milled are upon this shaft H and such shaft is rotated progressively, and if any looseness exists the work will be imperfect in consequence of vibration.

v The base or bed A has a central vertical opening or mortise adapted to receive a wheel ;I, which is permanently connected to the shaft II. It is preferable to inake this shaft H of Luniforrn size throughout and fit into the same rigidly a key adapted to pass into the keyseat in the worm-wheel I, and this key is of a width to slide lengthwise through the slot or opening in the flanges 5 before the screws are inserted into the same, so that the wheel I can be placed into its mortise or recess and then the shaft slipped into and through the same and the connection will be permanent. This wheel I is rotated by a screw or worm K upon a shaft L, which is preferably at an inclina- .tion in a plane perpendicular to the axis of the shaft II, and such shaft L and the worm K are permanently connected, preferably by across-pin,'and there are bearings 6 and 7 upon the bed or base A through which this shaft L passes, and it also passes out through the outer casingor end portion of the base A for the reception of a hand-wheel M, by whichsuch shaft L can be rotated,'and in so doing the wheel I, shaft H, and articles the shaft H and milled.

. plate the milling attachment-as a whole can,

I have shown a mandrel T in such shaft H carried by it can be rotated, and this wonm or screwgeanK'andthe- WhBGTLBJ'QPLCGUIfiatBlM fitted'in order that the rotation may be regular and Without any looseness or Vibration under the action of the milling-tools.-

The articles to be milled are connected with the projecting ends of the supporting-sha H. I have represented two gear-blanks M that are being acted upon by the milling-tools E. It is preferable to provide screw-threads 8 around the ends of the shaft: H for faceplates, chucks, or similar devices M and a clam p-screw or mandrel, which passes through the hubs or centralopenings-otthe gear-blanks or other articles that are to,- be attached to I remark that any desired clamping or attaching device may be provided at the ends of the shaft H; but I- prefer to make such shaft H hollow, with the tubular opening tapering at one end, so that a mandrel, shaft, tool-holder, or other device can be passed through or into this shaft H.

with clamping-nuts to hold the mand'rel'i'n place and to clamp the article to be milled.

' In performing the milling operation it is preferable to drive the worm or screw gear K by power. To effect this I put upon the shaft L a bevelgear-wheel O, which is loose thereon, and it is between a collar 9 and the hub of the hand-wheel M. This hand-wheel M is upona feather or key, soas always to turn withzthe shaft L; but it may be moved endwiseupon such shaftL by a nut 10 uponthe outer end of the shaft 1;, which inutmay be turned by hand to cause the hub of the handwheel M to clamp the tubular shaft of the bevelrgear O fi'rmliy between itself and the; collar 9, andthe shaftI? andits bevelpinion Q, which gears into the Wheel'O,flare rotated" by suitable power. Hence the said'gshaft' 1?, bevel-pinion Q, and g ar, Oimay be constantly rotated, and, the milling operaition will be; started" by tightening; the, nut 1.0.0r stepped; by loosening it; and? the han d;wheel;MZmay be madeluse'of-in turning the shaf ti,L ,wheelf I, shaft H, and'the article supported" by it ,in; either one direction or-vthe other.

It will' nowvbe apparent'thati the gear-blanks M or other articlesto be milled: are to be fastened upon-theends offtheshaft H, and by the-platen, swivel' plate, saddle, and, knee;

be raised'or lowered, or. movedihorizoll al yr or turned in either directionto bring thear; ticles thatJareto, be milled to their properpositions in relation to the: milling tool s, after which the slide-rests or other: supporting. de vicesmay be clamped firmly, andthe milling operations can-beperformedsuccessively and? with greatgrapidity and accuracyandltwoarticlfes, can be, milled simultaneouslygand, in, applying orremovingthe articles to. bemilled; itfis not necessary tostop the-millingengine, because the'rotation oftheshaft Hi and article vearried byit canvbe stopped by loosening the nut 10, and then the milling attachment can be drawn back from the-tools by rotatingthescrew 2 of' the plate i the finishedarticles removedand others applied in their stead, and then brought up to position, and the nut 10 is tightened to effect the rotation of the articles being milled.

1 The shafit' Pmay receive its rotary motion from any-suitable device; but I find it advantageous to employ an extension-shaft R and universal joints S, one of which is con- "nected: with thefprojecting end of the shaft P and the other universal joint is connected with any suitable rotating or feed shaft upon Lthe milling-engine, such as the shaft of the ,pulley N. By this construct-ion the rotation of the shaft P is easily maintained, and at the same time the platen B and the other supports for. the millingattachment can .be moved without interfering with the connection through. the extension-shaft and universal? joints employed in rotating the shaft P;

The swivel-plate O allows-the platen and milling attachment to be placed'withthe axis of the shaft H at an inclination to the axisof the milling-tool to adapt the device to-milling bevels, such as bevel gear-blankadtc and the rotating tool may be used for orna-v menting the surfaces of cylinder-heads, disks, 5 &c.,,with cycloidal striations by presenting such articles to a rotating mill or other tool,', the axis of the tool being perpendicular to the surface to be smoothed,dresse,d; or ornamented andreceivi'ngarotary motion omits, I00 own axis simultaneously with the rotarymovementy given to-the article,

The various purposes for whi'clitheattacliment, may be used will -beapparent; tothe: machinist, and. in em ployingthe; improvement the screw 2 may be either usedor; disconnected;

Two collars are neededonthe shaft Head jacent to the ends of it'sjbearings andinor der to hold the-screwmollar l'3'upon the shaft H in position, so that it may not. tighten'or I loosen, I" saw or cut in the inner po'rtionof the collar a tongue,l5' and tapeinl a screw. I 12L" to ,act upon theeud portionio f. the tongue, so that after the collar has, been, setup to- :15 place thescrew 14.- is tightened and;- clamps ;thecollar in place by forcingthe tongueupon ijthe screw-thread'sto furnish the friction regquired to keep-the collar from-turning;

If claim as my inventionj 1'.' The bed or, base A havihg the slotted: itubul'ar bearing, 4 and. tighteningrscrews-,.in. Zcombination with the supportingrshaft, H,. ipassing through such tubular. bearing and! {adapted torreceive, atitsends the articles to 12 5 i be; milled,aworm-wheeli I; surrounding the ishaft' H and'within acentral mortiseor openiingin the bedAy ascrew orworm pinion 7K, Eengaging thewheel I; 7 and. a. shaft. for rotatiingthe pinion, substantially, as, setforth.

i 2'. The combination, withrthebedlorbase A, ihaving bearings, of, the shafhHiwithin such jbearings and. adaptedto receive atits ends the article to be milled, the worm-wheel'l,

occupying the central mortise or opening in the bed or base, a worm-pinion K and its shaft for rotating the worm-wheel, ahandwheel, and a' loose bevel gear-wheel upon the shaft of the worm-pinion, a nut for clamping the hand-wheel and the bevel-wheel, and a driving-shaft and bevel-pinion, substantially as set forth.

3. The combination, Withthe supporting bed or base and the shaft H, of the wormwheelupon the shaft, a worm-pinion for rotating the same, a hand-wheel and shaft for the worm-pinion, aloose gear-Wheel upon said shaft, a nut for clamping the hand-wheel and gear-wheel to the shaft, and mechanism for rotating such gear-wheel, substantially as set forth.

4. The combination, with the bed or base, of the shaft H, passing through a bearing upon such base, and clamping attachments at both ends of such shaft for the article to be milled, a wheel, worm-pinion, and bevelgearing for rotating such shaft and article, an extension-shaft and universal joints at both ends of such shaft for rotating the gearing, and an adjustable platen or support for the base for holding the same and presenting the article to the milling-tool, substantially as set forth.

5. The combinatiomwith the bed or base, of the tubular shaft H, the worm wheel and pinion for rotating the same, a mandrel passing through such shaft and having a tapering parts connected with the same, substantially A as set forth.

6. The combination, with the milling-machine having a tool-spindle, a platen, and adjustable and swiveling beds or rests, of a supporting stock or base and means for securing the same to the platen, a work spindle or shaft supported in bearings on such base and mechanism atboth ends of such shaft for securing the work, a worm gear and pinion for rotating such shaft and the work, and a feed shaft and gearing for connecting with and rotating the worm-pinion, substantially as set forth. r

7. The combination, with the base and the work-spindle supported by the sameand projecting at both ends and adapted to receive two articles to be acted upon, of a wheel and worm-pinion for rotating the shaft and the work, a shaft and gearing for driving such worm-pinion, and mechanism for connecting and disconnecting the driving-shaft, substantially as set forth.

Signed by me this 13th day of February, 1891.

ALBERT D. PENTZ.

\Vitnesses:

' GEO. T. PINOKNEY, WILLIAM G. More. 

